I don't know if I dare to take out the movement by my self. Maybe i will ask my local watchmaker to help me out. Then I can post some pics!I doubt any of us will be able to tell you much, especially without seeing the movement. Take it to a local clock shop for info, and post a picture of the inside if you can.
I just thinks its pretty rare, after 2 hours cleaning the Internet, i came up with like 10 similar matches. But its just sales adds. And not much real deal info, just people that writes prices from 900 usd - 3200 usd. And says that its around the 1930.Firstly - not to be rude - you don't know that it is rare by the very nature of the fact that you admit you know nothing about it. When someone does/says this it seems like a "sales post".
Secondly I doubt your clock is worth more than £200 from what I have seen of the market.
Good luck with your investigation - I hope you find out what you need to know and for the reasons that it is important.